Movable arm of excavator

By installing reinforcement side plates and reinforcement plates in the boom mechanism of the excavator boom, the problem of insufficient rigidity of the boom is solved, the overall rigidity is improved, and the negative impact of increased weight and cost is avoided.

CN223034091UActive Publication Date: 2025-06-27QINGDAO LOVOL EXCAVATOR +1
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Patent Information

Application Number
CN202422075165.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-26
Publication Date
2025-06-27
Estimated Expiration
2034-08-26

AI Technical Summary

Technical Problem

The excavator boom is not rigid enough in the weld connection between the inner reinforcement plate and the side plate, resulting in concentrated strain and reduced fatigue life. Increased side plate thickness leads to increased weight, cost and reduced working efficiency.

Method used

An excavator boom is designed. By providing a reinforcement side plate between the middle side plate of the second boom mechanism and the rear side plate of the third boom mechanism, and a reinforcement rib plate is arranged inside the reinforcement side plate, so that the reinforcement side plate and the reinforcement rib plate are perpendicular to each other, forming a part of the middle section structure of the boom arm, and improving the overall rigidity.

Benefits of technology

It effectively improves the rigidity of the boom, avoids strain concentration and fatigue life due to insufficient rigidity, and avoids the increase in weight and cost caused by increasing the thickness of the side plate.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223034091U_ABST
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Abstract

The utility model discloses a movable arm of an excavator, which belongs to the technical field of engineering machinery and comprises a first movable arm mechanism, a second movable arm mechanism and a third movable arm mechanism. The second movable arm mechanism comprises a middle cover plate, middle side plates and a middle bottom plate, the middle side plates are arranged at the two ends of the lower portion of the middle cover plate, and the middle bottom plate is arranged on the lower portions of the middle side plates. The third movable arm mechanism comprises a rear cover plate, rear side plates and a rear bottom plate, the rear side plates are arranged at the two ends of the lower portion of the rear cover plate, and the rear bottom plate is arranged on the lower portions of the rear side plates. A reinforcing side plate is arranged between the middle side plate and the rear side plate, a reinforcing rib plate is arranged on the inner side of the reinforcing side plate, and the reinforcing side plate is perpendicular to the reinforcing rib plate. A first welding seam is arranged at the connecting position of the middle bottom plate and the rear bottom plate, a second welding seam is arranged at the connecting position of the middle cover plate and the rear cover plate, the first welding seam is located at the lower end of the reinforcing side plate, and the second welding seam is located at the upper end of the reinforcing side plate. The strain concentration caused by insufficient rigidity can be solved, the negative influence caused by obvious increase of the weight of the steel plate can be eliminated, and the rigidity of the movable arm is effectively improved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of construction machinery, and particularly relates to a boom of an excavator. Background Art

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] An excavator is a main device in construction machinery and is widely used in industrial, civil construction, transportation, water conservancy and electric power projects, mine excavation and modern military projects. When designing the boom structure of large excavators, great attention is paid to the rib plates and welds inside the cavity to increase the strength and stiffness of the structure under complex stress conditions and minimize the fatigue problems caused by stress concentration. Usually, a three-section welded box structure is selected.

[0004] The problem is that at the weld joint between the internal rib plate and the side plate, there is a reduction in fatigue life caused by strain concentration due to insufficient rigidity. If the rigidity is increased by increasing the thickness of the side plate, the accompanying negative effects are the obvious increase in weight, the increase in the overall cost of the machine, and the increase in load leading to increased fuel consumption and decreased operation efficiency. Content of the Utility Model

[0005] Aiming at the above problems, the utility model provides a boom of an excavator, which can solve the strain concentration caused by insufficient rigidity, eliminate the negative effects brought by the obvious increase in the weight of the steel plate, and effectively improve the rigidity of the boom.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A boom of an excavator includes a first boom mechanism, a second boom mechanism and a third boom mechanism; the second boom mechanism includes a middle cover plate, middle side plates and a middle bottom plate, the two ends of the lower part of the middle cover plate are provided with middle side plates, and the lower part of the middle side plates is provided with a middle bottom plate; the third boom mechanism includes a rear cover plate, rear side plates and a rear bottom plate, the two ends of the lower part of the rear cover plate are provided with rear side plates, and the lower part of the rear side plates is provided with a rear bottom plate;

[0008] A reinforcing side plate is arranged between the middle side plate and the rear side plate, reinforcing rib plates are arranged on the inner side of the reinforcing side plate, and the reinforcing side plate and the reinforcing rib plates are perpendicular to each other; a first weld is arranged at the connection position of the middle bottom plate and the rear bottom plate, a second weld is arranged at the connection position of the middle cover plate and the rear cover plate, the first weld is at the lower end of the reinforcing side plate, and the second weld is at the upper end of the reinforcing side plate.

[0009] Further, a second swing arm mechanism is provided at one end of the first swing arm mechanism, and a third swing arm mechanism is provided at one end of the second swing arm mechanism; the first swing arm mechanism, the second swing arm mechanism and the third swing arm mechanism are fixedly connected.

[0010] Further, ear plates are symmetrically provided at the upper end of the middle cover plate, through holes are provided on the ear plates, and the ear plates are fixedly connected to the middle cover plate.

[0011] Further, the upper end of the middle cover plate is fixedly connected to the upper end of the middle side plate, and the lower end of the middle bottom plate is fixedly connected to the lower end of the middle side plate; one end of the side portion of the middle side plate is connected to one end of the reinforcing side plate.

[0012] Further, the upper end of the rear cover plate is fixedly connected to the upper end of the rear side plate, and the lower end of the rear bottom plate is fixedly connected to the lower end of the rear side plate; the side portion of the rear side plate is connected to the other end of the reinforcing side plate.

[0013] Further, both sides of the reinforcing rib plate are connected to the reinforcing side plate, the upper part of the reinforcing side plate is connected to the lower end of the middle cover plate, and the lower part of the reinforcing side plate is connected to the upper end of the middle bottom plate.

[0014] Further, the first swing arm mechanism includes a front cover plate, front side plates and a front bottom plate, the front side plates are provided at both ends of the lower part of the front cover plate, and the front bottom plate is provided at the lower end of the front side plates.

[0015] Further, the upper end of the front cover plate is fixedly connected to the upper end of the front side plates, and the lower end of the front bottom plate is fixedly connected to the lower end of the front side plates.

[0016] Further, a bearing seat is provided at one end of the first swing arm mechanism, the upper end of the bearing seat is connected to the front cover plate, the lower end is connected to the front bottom plate, and the side portion is connected to the front side plates.

[0017] Further, the thickness of the reinforcing side plate is greater than the thickness of the middle side plate.

[0018] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0019] The present utility model is provided with a first swing arm mechanism, a second swing arm mechanism and a third swing arm mechanism. The first to third swing arm mechanisms all include a cover plate, side plates and a bottom plate. The swing arm is formed by connecting the cover plate, side plates, bottom plate, reinforcing side plate and reinforcing rib plate to each other. The reinforcing side plate is arranged between the middle side plate of the second swing arm mechanism and the rear side plate of the third swing arm mechanism, and the reinforcing side plate is connected by the reinforcing rib plate, which improves the overall rigidity. Moreover, the first weld seam and the second weld seam are both located at the positions of the reinforcing side plate and the reinforcing rib plate, which improves the connection strength of the welding position. Compared with the method of increasing the thickness of all side plates to improve rigidity, it solves the strain concentration caused by insufficient rigidity and can also eliminate the negative impact caused by the obvious increase in the weight of the side plates;

[0020] During excavation operations, off-center loading can cause torsional deformation of the boom. Strengthening the rib plate can increase the torsional interface modulus, thereby improving the overall rigidity. Strengthening the side plate setting can increase the torsional and bending section moduli, thereby improving local and overall rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a three-dimensional diagram of the excavator boom of the utility model;

[0023] Figure 2 It is an internal view of the excavator boom of the utility model;

[0024] Figure 3 This is a structural diagram of the second boom mechanism of the excavator boom of the utility model;

[0025] In the figure: 1. first movable arm mechanism; 11. front cover plate; 12. front side plate; 13. front bottom plate; 2. second movable arm mechanism; 21. middle cover plate; 22. middle side plate; 23. middle bottom plate; 3. third movable arm mechanism; 31. rear cover plate; 32. rear side plate; 33. rear bottom plate; 4. first weld; 5. second weld; 6. reinforced side plate; 7. reinforced rib plate; 8. ear plate; 9. bearing seat. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] The utility model is described in detail below in conjunction with the accompanying drawings. The embodiment discloses an excavator boom, such as Figure 1 As shown, it includes a first movable arm mechanism 1, a second movable arm mechanism 2 and a third movable arm mechanism 3; the second movable arm mechanism 2 is arranged at one end of the first movable arm mechanism 1, and the third movable arm mechanism 3 is arranged at one end of the second movable arm mechanism 2; the first movable arm mechanism 1, the second movable arm mechanism 2 and the third movable arm mechanism 3 are fixedly connected.

[0028] The second movable arm mechanism 2 includes a middle cover plate 21, a middle side plate 22 and a middle bottom plate 23. The middle side plates 22 are arranged at both ends of the lower part of the middle cover plate 21, and the middle bottom plate 23 is arranged at the lower part of the middle side plate 22. The third movable arm mechanism 3 includes a rear cover plate 31, a rear side plate 32 and a rear bottom plate 33. The rear side plates 32 are arranged at both ends of the lower part of the rear cover plate 31, and the rear bottom plate 33 is arranged at the lower part of the rear side plate 32.

[0029] As Figure 2 shown, a reinforcing side plate 6 is provided between the middle side plate 22 and the rear side plate 32. A reinforcing rib plate 7 is provided inside the reinforcing side plate 6, and the reinforcing side plate 6 and the reinforcing rib plate 7 are perpendicular to each other. A first weld seam 4 is provided at the connecting position of the middle bottom plate 23 and the rear bottom plate 33, and a second weld seam 5 is provided at the connecting position of the middle cover plate 21 and the rear cover plate 31. The first weld seam 4 is located at the lower end of the reinforcing side plate 6, and the second weld seam 5 is located at the upper end of the reinforcing side plate 6. Both the first weld seam 4 and the second weld seam 5 are located at the positions of the reinforcing side plate 6 and the reinforcing rib plate 7, improving the connection strength of the welding positions.

[0030] The boom is composed of the first to third boom mechanisms 3. The cover plates, side plates and bottom plates of the first to third boom mechanisms 3 together form a box structure. The cover plate is formed by connecting the front cover plate 11, the middle cover plate 21 and the rear cover plate 31 to each other. The bottom plate is formed by connecting the front bottom plate 13, the middle bottom plate 23 and the rear bottom plate 33 to each other. The side plates are divided into four sections, namely the rear side plate 32, the reinforcing side plate 6, the middle side plate 22, the front side plate 12, etc., which are connected by butt welds. The reinforcing side plate 6 is vertically connected to the internal reinforcing rib plate 7 to form a part of the middle section structure of the boom. The reinforcing side plate 6 is located between the rear side plate 32 and the middle side plate 22, that is, in the transition area between the second boom mechanism 2 and the third boom mechanism 3. The butt weld between the middle cover plate 21 and the rear cover plate 31 and the butt weld between the rear bottom plate 33 and the middle bottom plate 23 are both located in the box area formed by the reinforcing side plate 6 to improve the rigidity of the butt joint position. A reinforcing rib plate 7 is provided between the middle side plate 22 and the rear side plate 32, and an independent thickened reinforcing side plate 6 is formed around the reinforcing rib plate 7, which can not only solve the strain concentration caused by insufficient rigidity, but also eliminate the negative impact caused by the obvious increase in the weight of the steel plate, effectively improving the rigidity of the boom.

[0031] Lugs 8 are symmetrically provided at the upper end of the middle cover plate 21. Through holes are provided on the lugs 8, and the lugs 8 are fixedly connected to the middle cover plate 21. The upper end of the middle cover plate 21 is fixedly connected to the upper end of the middle side plate 22, and the lower end of the middle bottom plate 23 is fixedly connected to the lower end of the middle side plate 22. The side part of the middle side plate 22 is connected to one end of the reinforcing side plate 6. The upper end of the rear cover plate 31 is fixedly connected to the upper end of the rear side plate 32, and the lower end of the rear bottom plate 33 is fixedly connected to the lower end of the rear side plate 32. The side part of the rear side plate 32 is connected to the other end of the reinforcing side plate 6. Both sides of the reinforcing rib plate 7 are connected to the reinforcing side plate 6. As Figure 3 shown, the upper part of the reinforcing side plate 6 is connected to the lower end of the middle cover plate 21, and the lower part of the reinforcing side plate 6 is connected to the upper end of the middle bottom plate 23.

[0032] The first boom mechanism 1 includes a front cover plate 11, front side plates 12 and a front bottom plate 13. The front side plates 12 are arranged at both ends of the lower part of the front cover plate 11, and the front bottom plate 13 is arranged at the lower end of the front side plates 12. The upper end of the front cover plate 11 is fixedly connected to the upper end of the front side plates 12, and the lower end of the front bottom plate 13 is fixedly connected to the lower end of the front side plates 12. A bearing seat 9 is arranged at one end of the first boom mechanism 1. The upper end of the bearing seat 9 is connected to the front cover plate 11, the lower end is connected to the front bottom plate 13, and the side part is connected to the front side plates 12. The thickness of the reinforcing side plate 6 is greater than the thickness of the middle side plate 22. The increase in the plate thickness of the reinforcing side plate 6 compared to the middle side plate 22 improves the local rigidity.

[0033] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. An excavator boom, characterized in that: It includes a first movable arm mechanism, a second movable arm mechanism and a third movable arm mechanism; the second movable arm mechanism includes a middle cover plate, a middle side plate and a middle bottom plate, the middle side plates are arranged at both ends of the lower part of the middle cover plate, and the middle bottom plate is arranged at the lower part of the middle side plate; the third movable arm mechanism includes a rear cover plate, a rear side plate and a rear bottom plate, the rear side plates are arranged at both ends of the lower part of the rear cover plate, and the rear bottom plate is arranged at the lower part of the rear side plate; A reinforcing side panel is arranged between the middle side panel and the rear side panel, a reinforcing rib plate is arranged on the inner side of the reinforcing side panel, and the reinforcing side panel and the reinforcing rib plate are perpendicular to each other; a first weld is arranged at the connecting position of the middle bottom panel and the rear bottom panel, a second weld is arranged at the connecting position of the middle cover panel and the rear cover panel, the first weld is located at the lower end of the reinforcing side panel, and the second weld is located at the upper end of the reinforcing side panel.

2. An excavator boom according to claim 1, characterized in that: A second arm mechanism is arranged at one end of the first arm mechanism, and a third arm mechanism is arranged at one end of the second arm mechanism; the first arm mechanism, the second arm mechanism and the third arm mechanism are fixedly connected.

3. An excavator boom according to claim 1, characterized in that: Ear plates are symmetrically arranged on the upper end of the middle cover plate, through holes are arranged on the ear plates, and the ear plates are fixedly connected to the middle cover plate.

4. An excavator boom according to claim 1, characterized in that: The middle cover plate is fixedly connected to the upper end of the middle side plate, and the middle bottom plate is fixedly connected to the lower end of the middle side plate; the side portion of the middle side plate is connected to one end of the reinforcing side plate.

5. The excavator boom according to claim 1, characterized in that: The rear cover plate is fixedly connected to the upper end of the rear side plate, and the rear bottom plate is fixedly connected to the lower end of the rear side plate; the side portion of the rear side plate is connected to the other end of the reinforcing side plate.

6. An excavator boom according to claim 1, characterized in that: The two sides of the reinforcing rib plate are connected to the reinforcing side plates, the upper part of the reinforcing side plates is connected to the lower end of the middle cover plate, and the lower part of the reinforcing side plates is connected to the upper end of the middle bottom plate.

7. An excavator boom according to claim 1, characterized in that: The first movable arm mechanism comprises a front cover plate, a front side plate and a front bottom plate. The front side plates are arranged at both ends of the lower part of the front cover plate, and the front bottom plate is arranged at the lower end of the front side plate.

8. An excavator boom according to claim 7, characterized in that: The front cover plate is fixedly connected to the upper end of the front side plate, and the front bottom plate is fixedly connected to the lower end of the front side plate.

9. An excavator boom according to claim 7, characterized in that: A bearing seat is arranged at one end of the first movable arm mechanism, the upper end of the bearing seat is connected to the front cover plate, the lower end is connected to the front bottom plate, and the side part is connected to the front side plate.

10. An excavator boom according to claim 1, characterized in that: The thickness of the reinforced side plate is greater than the thickness of the middle side plate.